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To reproduce - have two java files open in editor - on editor tab select "Diff To ..." - In vis diff window, add a character to the editable file Observe that the undo button does not enable. (the save all button does)
Oops, left out the obvious step - in Diff To dialog, select the other file, click the Diff button
fix: http://hg.netbeans.org/cdev/rev/c1f18e05661e
Integrated into 'main-golden', will be available in build *201004090201* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress) Changeset: http://hg.netbeans.org/main/rev/c1f18e05661e User: Ondrej Vrabec <ovrabec@netbeans.org> Log: Issue #183685 - "Diff To ..." changes do not enable undo